CSAMT法在巴音戈壁盆地尚丹坳陷砂岩型铀矿勘查中的应用  

Application of CSAMT method in sandstone-type uranium deposit exploration in Shangdan depression,Bayingebi Basin

作　　者：焦智伟 张伟[1,2,3] 刘波 孟锐 李鹏 郭煦劼 JIAO Zhiwei;ZHANG Wei;LIU Bo;MENG Rui;LI Peng;GUO Xujie(Airborne Survey and Remote Sensing Center,China National Nuclear Corporation,Shijiazhuang 050002,Hebei,China;Key Laboratory of Uranium Resources Geophysical Exploration Technology,China National Nuclear Corporation,Shijiazhuang 050002,Hebei,China;Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang 050002,Hebei,China;Geolgical Brigade No.208,China National Nuclear Corporation,Baotou 014010,Inner Mongolia,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]中核集团铀资源地球物理勘查技术中心(重点实验室),河北石家庄050002 [3]河北省航空探测与遥感技术重点实验室,河北石家庄050002 [4]核工业二○八大队,内蒙古包头014010

出　　处：《矿产与地质》2023年第2期317-326,350,共11页Mineral Resources and Geology

基　　金：中国核工业地质局“内蒙古阿拉善银根地区可控源音频大地电磁测量”项目(编号:202103-03);核能开发“基于航空高光谱和伽马能谱的铀矿勘查技术研究”项目(编号:202004010012)共同资助。

摘　　要：中新生代盆地砂岩型铀矿床是我国重要的铀矿床类型之一,是当前铀矿找矿的主要勘查方向。巴音戈壁盆地砂岩型铀矿床多为隐伏矿体,找矿目的层露头少,具有“泥-砂-泥”储层结构,断裂在控制盆地构造格局、找矿目标层的空间展布以及导通深部还原流体和地下水排泄等方面均具有主导作用。由于地表大面积第四系覆盖,因此亟需借助物探手段查明深部地层结构、断裂构造以及找矿目标层发育情况,为铀矿勘查钻探工程布置提供依据。可控源音频大地电磁测量(CSAMT)具有横向分辨率高、抗干扰能力强的特点。通过在巴音戈壁盆地尚丹坳陷开展CSAMT测量,对研究区的地层结构、断裂构造和找矿目标层及其砂体发育特征做出了客观的解释,有效地指导了钻探工程部署,在砂岩型铀矿勘查中取得了较好的效果,为相关地区的砂岩型铀矿勘查提供了借鉴。Sandstone-type uranium deposit in Meso-Cenozoic basin is one of the important types of uranium deposits in China and it is the main exploration direction of uranium deposit at present.The sandstone-type uranium deposits in Bayingebi Basin are mostly concealed ore bodies,and the target prospecting layers have few outputs,with mud-sand-mud reservoir structure.The faults play a leading role to control the basin tectonic pattern,the spatial distribution of the target prospecting layers,and the channeling of deep reducing fluids and groundwater drainage.Due to the large area of the earth surface covered by quaternary system,it is urgent to find out the deep stratigraphic structure,fault structure and the development of prospecting target layer by means of geophysical exploration,so as to provide a basis for the layout of uranium exploration and drilling engineering.Controllable source audio frequency magnetotelluric survey(CSAMT)has the characteristics of high lateral resolution and strong anti-interference ability.Based on CSAMT measurement in Shangdan Depression,Bayingebi Basin,the stratigraphic structure,fault structure,prospecting target layer and sand body development characteristics have been objectively explained in the study area.The result can be used as a reference for sandstone type uranium deposit exploration in the related areas.

关 键 词：CSAMT 砂岩型铀矿 地层结构 断裂构造 找矿目标层 巴音戈壁盆地 

分 类 号：P631.3[天文地球—地质矿产勘探] P619.14[天文地球—地质学]